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28
OPTIONAL FACEMASK
The oxygen mask design includes the mounting brackets necessary to connect the mask to the HGU-56/P
helmet, with or without the maxillofacial shield installed. It may be used with the optional snap adapters
to connect the mask to the HGU-84/P helmet without the maxillofacial shield installed. This provides
versatility to air crew members allowing them to customize the system according to mission demands.
The system remains stable throughout the flight performance envelope of helicopters, is easy to don, and
has quick disconnect features. The mask assembly's quick release snaps and adjustable fasteners allow
three unique configurations wherein the maxillofacial shield and oxygen mask can be used independently
or together for maximum protection.
The mask includes an integrated M-169A/AIC dynamic 5-ohm microphone to aid communications.
Use of a mask will supply an adequate oxygen mixture to users who are under mental or physical stress
and who, as a result, will breathe through their mouths instead of their noses. Oxygen enters from the
OPC regulator hose and travels through 90° oxygen inlet port of the mask to allow the oxygen to enter
the mask cavity. Exhaled gases exit the mask through the exhalation valve (Fig. 37). Ensure the GMM
Plug is inserted into the 90° elbow on the opposite side of the mask (Fig. 38).
WARNING
- The GMM plug must be inserted into the 90° inlet port on the opposite side of the
mask in order to function properly.
WARNING
- Oxygen should be delivered to the inlet port on the inhalation valve side of the mask
to ensure the proper dilution of oxygen with the ambient air in the mask cavity.
WARNING
- Disinfect the facemask or nasal cannula & nose piece after each use to avoid bacteriological
contamination and for cleanliness. Cleaning can be accomplished with isopropyl alcohol.
Inlet Port
Inlet Port
Figure 37
PHODS User's Manual
GMM Plug
Figure 38
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